身體位置
151.身體中線:center[medium」line of the body
152.軀干位置:trunk position
153.身體平衡:body balance
154.浮力:buoyancy
155.浮出水面:surface
156.浮在水面:keep afloat
157.浸入水中:submerge
158.下沉:drop; sink
159.水面線(蛙泳中頭的位置):waterline
160.俯臥姿勢:face down; prone position
161.仰臥姿勢:back floating position
162.俯臥漂游姿勢:prone float
163.流線型姿勢:streamlined position
164.低頭:drop the head
165.弓背[身] :arch the back
166.時起時伏(在水中):ducking; undulation
167.滑行:glide